Malicious PDF — malware analysis report

Static analysis result for SHA-256 964d6598b5d85a19…

MALICIOUS

PDF

82.0 KB Created: 2021-06-01 03:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1b68b9a1d1a67a5596287047fe7b5e36 SHA-1: 13bcc6d5487e1f9ec5b4fc9b5298cb465132114b SHA-256: 964d6598b5d85a19bd7d6367d405595070079762c68fb0704a0aa266aaec25d5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/pbw?utm_term=geometry+dash+unblocked+levels PDF link annotation
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/joluxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd9c8258cb7d.pdfIn PDF document text
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/e9ad5f37723dc.pdfIn PDF document text
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/207c37394f16d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492253/normal_5fed61bf5ab2a.pdfIn PDF document text
    • https://nitipitu.weebly.com/uploads/1/3/0/7/130775162/vevotiza.pdfIn PDF document text
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/botixozuxusugev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_6069993a473f6.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/0161833904.pdfIn PDF document text
    • https://sewimoranekodov.weebly.com/uploads/1/3/0/9/130969375/6482dd0f6efb55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekuzax.pbworks.com/f/xojosibaluxirabatutesu.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144420657/92781492534.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/voice_lessons_syntax_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cb3ba2-106d-4ad0-aa93-382095384084/bovofivunamefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bb5219-04e1-46a5-b48d-0f2a132940e8/luvagutuzedipugux.pdfIn PDF document text
    • http://zigunef.pbworks.com/f/rugodiwujofiwawewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937609bc-7054-48e9-8695-5d508880b609/non_destructive_testing_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57312204-dc82-423b-b03e-67a86170fbf6/kerufir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9264b4-87b1-40fb-93ee-25ec36756f59/the_expanse_season_4_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa39b30-4439-4e19-bcac-0aa5af88350d/12888315218.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 4608 bytes
SHA-256: 67555a4c562c67f1857de76982f918880335bd8803745facdf128861781ce979
font_02_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 5576 bytes
SHA-256: 8f27a92e99abc512c519de77234772b6057475ffb142b255da20200838d0c250
font_03_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 12680 bytes
SHA-256: 4c65f93e5334b8e53a55376acba824c4f38cf43b9d7eb4749103f7b676d4c978

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